Set hostname on GCP

Split GCP startup script in two:

 + One started before Docker, to set the hostname
 + Another to run the startup script

Signed-off-by: David Gageot <david@gageot.net>

alpine/Dockerfile

@@ -57,7 +57,8 @@ RUN \
   rc-update add containerd default && \
   rc-update add aws default && \
   rc-update add azure default && \
-  rc-update add gcp default && \
+  rc-update add gcp-hostname default && \
+  rc-update add gcp-startup default && \
   true
 
 CMD ["/mkinitrd.sh"]

alpine/packages/gcp/etc/init.d/gcp

@@ -1,29 +0,0 @@
-#!/sbin/openrc-run
-
-description="Bootstrap procedure if running on Docker GCP edition"
-
-depend()
-{
-  need docker
-  need net
-}
-
-start()
-{
-  [ "$(mobyplatform)" != "gcp" ] && exit 0
-  ebegin "Running GCP-specific initialization"
-
-  ebegin "Run startup script"
-
-  temp_file=$(mktemp)
-  curl -s http://metadata.google.internal/computeMetadata/v1/instance/attributes/startup-script -H "Metadata-Flavor: Google" > ${temp_file}
-  [ -s "${temp_file}" ] && sh "${temp_file}"
-  rm -f "${temp_file}"
-
-  eend 0
-}
-
-stop()
-{
-  [ "$(mobyplatform)" != "gcp" ] && exit 0
-}

alpine/packages/gcp/etc/init.d/gcp-hostname

@@ -0,0 +1,34 @@
+#!/sbin/openrc-run
+
+description="Set hostname on Docker GCP edition"
+
+depend()
+{
+  need net
+  before docker
+}
+
+metadata() {
+  curl -sH 'Metadata-Flavor: Google' http://metadata.google.internal/computeMetadata/v1/${1}
+}
+
+start()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+
+  ebegin "Set hostname based on what GCP tells us it should be"
+
+  IP=$(metadata instance/network-interfaces/0/ip)
+  HOSTNAME=$(metadata instance/hostname)
+  echo "${IP} ${HOSTNAME} ${HOSTNAME%%.*}  # Added by Google" >> /etc/hosts
+  echo "169.254.169.254 metadata.google.internal  # Added by Google" >> /etc/hosts
+  echo ${HOSTNAME%%.*} >/etc/hostname
+  hostname -F /etc/hostname
+
+  eend 0
+}
+
+stop()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+}

alpine/packages/gcp/etc/init.d/gcp-startup

@@ -0,0 +1,40 @@
+#!/sbin/openrc-run
+
+description="Run startup/shudown scripts on Docker GCP edition"
+
+depend()
+{
+  need net
+}
+
+metadata() {
+  curl -sH 'Metadata-Flavor: Google' http://metadata.google.internal/computeMetadata/v1/${1}
+}
+
+start()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+
+  ebegin "Run startup script"
+
+  temp_file=$(mktemp)
+  metadata /instance/attributes/startup-script > ${temp_file}
+  [ -s "${temp_file}" ] && sh "${temp_file}"
+  rm -f "${temp_file}"
+
+  eend 0
+}
+
+stop()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+
+  ebegin "Run shutdown script"
+
+  temp_file=$(mktemp)
+  metadata /instance/attributes/shutdown-script > ${temp_file}
+  [ -s "${temp_file}" ] && sh "${temp_file}"
+  rm -f "${temp_file}"
+
+  eend 0
+}